#!/bin/bash

extensions=("mp4" "avi" "mov" "mkv" "flv" "wmv")

echo "开始批量转码(H.264 MP4)..."
echo

for ext in "${extensions[@]}"; do
    for file in *."$ext"; do
        [ -f "$file" ] || continue

        # 👉 提取类似 1 (12).mp4 → 12
        base=$(echo "$file" | sed -E 's/^1 \(([0-9]+)\)\.[^.]+$/\1/')

        # 👉 如果匹配成功，就用纯数字，否则用原文件名
        if [[ "$base" =~ ^[0-9]+$ ]]; then
            output="${base}-h264.mp4"
        else
            output="${file%.*}-h264.mp4"
        fi

        if [ ! -f "$output" ]; then
            echo "正在转码: $file --> $output"

            ffmpeg -i "$file" \
                -c:v libx264 -preset medium -crf 23 \
                -c:a copy \
                "$output"

            if [ $? -eq 0 ]; then
                echo "完成: $file"
            else
                echo "转码失败: $file"
            fi
            echo
        else
            echo "跳过 $file,因为 $output 已存在。"
        fi
    done
done

echo "所有任务执行完毕。"